package runconfig
 
 import (

 	"encoding/json"
 	"io"

 	"github.com/docker/engine-api/types/container"

 )
 

 // DecodeHostConfig creates a HostConfig based on the specified Reader.
 // It assumes the content of the reader will be JSON, and decodes it.

 func DecodeHostConfig(src io.Reader) (*container.HostConfig, error) {

 	decoder := json.NewDecoder(src)
 

 	var w ContainerConfigWrapper

 	if err := decoder.Decode(&w); err != nil {
 		return nil, err

 	}

 	hc := w.getHostConfig()

 	return hc, nil

 }

 
 // SetDefaultNetModeIfBlank changes the NetworkMode in a HostConfig structure
 // to default if it is not populated. This ensures backwards compatibility after
 // the validation of the network mode was moved from the docker CLI to the
 // docker daemon.

 func SetDefaultNetModeIfBlank(hc *container.HostConfig) *container.HostConfig {

 	if hc != nil {

 		if hc.NetworkMode == container.NetworkMode("") {
 			hc.NetworkMode = container.NetworkMode("default")

 		}
 	}
 	return hc
 }